How do I fit a 2.5'; hard drive to my computer case?

What must I buy in order to fit it to a case that only fits 3.5'; hard drives?How do I fit a 2.5'; hard drive to my computer case?
This:


http://www.newegg.com/Product/Product.as鈥?/a>





If you have a standard IDE laptop harddrive.








But if you are jsut trying to copy things off, get a 2.5'; external laptop hard drive case. That way you'll have a portable USB drive.